Coil unit, non-contact power transmission device, non-contact power reception device, non-contact power supply system, and vehicle

US20130038281A1Inactive Publication Date: 2013-02-14TOYOTA JIDOSHA KK +1
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
TOYOTA JIDOSHA KK
Publication Date
2013-02-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

A coil unit performs at least one of transmission and reception of electric power using electromagnetic resonance between the coil unit and a primary resonance coil disposed to face the coil unit. The coil unit includes a secondary resonance coil that includes a plurality of coils, and that electromagnetically resonates with the primary resonance coil. A first coil among the plurality of coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of coils, with respect to a plane that faces the primary resonance coil.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The invention relates to a coil unit, a non-contact power transmission device, a non-contact power reception device, a non-contact power supply system, and a vehicle. More particularly, the invention relates to a coil structure that reduces leakage electromagnetic fields that occur when electric power is supplied in a non-contact manner using electromagnetic resonance.

[0003] 2. Description of the Related Art

[0004] Electrically-driven vehicles, such as electric vehicles and hybrid vehicles, have received much attention, as environmentally-friendly vehicles. Each of the electrically-driven vehicles is provided with a motor that generates drive power for driving the vehicle, and a rechargeable power storage device that stores electric power to be supplied to the motor. The hybrid vehicles include a vehicle provided with an internal combustion engine that serves as a power source, in addition to the motor; and a vehicle provi...

Claims

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